Aviation Accident Summaries

Aviation Accident Summary LAX91LA315

CORONA, CA, USA

Aircraft #1

N5233S

PIPER PA32-300

Analysis

WHEN THE AIRCRAFT'S ENGINE FAILED DURING A VISUAL APPROACH FOR LANDING THE PILOT EXECUTED AN EMERGENCY LANDING. DURING THE EMERGENCY DESCENT HE NEGLECTED TO MAINTAIN AN AIRSPEED ABOVE THE AIRCRAFT'S STALL SPEED. THE AIRCRAFT STALLED AND IMPACTED THE GROUND IN ROUGH TERRAIN. AN EXAMINATION OF THE POWER PLANT AFTER THE ACCIDENT DISCLOSED THAT THE LEFT MAGNETO IMPULSE COUPLING FLYWEIGHTS STRUCK THE STOP PINS. THE FLYWEIGHT-STOP PIN IMPACT SEIZED THE MAGNETO AND SHEARED THE ACCESSORY DRIVE GEAR ALIGNMENT DOWEL. THIS FAILURE RESULTED IN THE UNCOUPLING THE ACCESSORY DRIVE TRAIN AND THE ENGINE FAILED.

Probable Cause and Findings

THE PILOT'S FAILURE TO MAINTAIN AN AIRSPEED ABOVE THE AIRCRAFT'S STALL SPEED AFTER THE ENGINE FAILED. FACTORS CONTRIBUTING TO THE ACCIDENT WERE: THE FAILURE OF THE ENGINE, MAGNETO AND ACCESSORY DRIVE GEAR, THE ROUGH TERRAIN CONDITIONS OVER WHICH THE ENGINE FAILED AND THE PILOT-IN-COMMANDS LACK OF TOTAL EXPERIENCE.

 

Source: NTSB Aviation Accident Database

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